Could be the old problem of having an oversized/out of round shell rim stick in the rim recess. New ammo tends to have poor made brass bases these days. AA's are the worst. I have three guns - two Parkers and a JD Dougal that will stick shut if I shoot AA's in them. My Repro 28 is the worst. I've had to put it into a rubber jawed vise where I'm forcing the barrels closed even more then gently apply pressure until the lever moves all the way right, then hold the lever while I release the vise - 4 hands helps here - and pick the gun out and open it. Pretty scary. My DH12 sticks but not that badly, but any more I just shoot STS or vintage paper ammo in it and never have an issue.
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